Ncert maths 9th TRIANGLE lesson ex 7.1 3 rd sum
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AD =BC. (GIVEN)
<OBC =<OAD=90 (perpendicular)
<BOC=<AOD (vertically opposite angle)
hence, BOC is congurent to AOD, then
BOC = AOD
OD =OC
then CD bisects AB
<OBC =<OAD=90 (perpendicular)
<BOC=<AOD (vertically opposite angle)
hence, BOC is congurent to AOD, then
BOC = AOD
OD =OC
then CD bisects AB
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